Grinding machine



GRIND NG MACHNE Filed Janr l2, 1935 4 Sheets-Sheet l Oct. 9, W' D ARCHEA,976,109

GRINDI NG MACHINE Filed Jan. l2, 1955 4 Sheets-Sheet 2 62 JQ/ gIIHUHHIIHWHH I J? f l! l i? f/ y m af fa 4f d Z f gf 75 47 7),; r/ ff jylmmlun /6 ///O f^ f@ c@ 74 .www f; /f/f MJ@ j,

Iig' 77 Oct. 9, 1934.

w. D. ARCHEA 1,976,109

GRINDING MACHINE Filed Jan. l2, 1933 4 Sheets-Sheet 5 @M 65e/@MM @9 W. DARQHEA GRINDING MACHINE Q Filed Jan. l2, 1935 4 Sheets-Sheet 4 wwwPatent @et 9, i934 ras GRINDEZG MACHINE waiter n. ma, cinemas, om, en,Cincinnati Grinders Incorporated, Cincinnati,

Ohio, a corporation of h10 Application January 12,

manually or semiautomatically lor expeditiously lo producing such workpieces.

Another object of the. invention is the provision of agrinding machinefor automatically centering and clamping the work in position prior tothe presentation thereof to the grind- 15 ing wheel and subsequentlywithdrawing the work from the grinding wheel, releasing and ejectingsame from the machine.

A further object er uns invention is me prt vision of a simple improvedmachine for accom? plishing the above objects.

Other objects and advantages of the present invention should be readilyapparent by reference to the following speciiication considered inconjunction with the accompanying drawings and it is to be understoodthat any modincations lmay be made in the exact structural details thereshown and described, within the scope of the appended claims, withoutdeparting from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a iront elevational view of the grinding machine embodyingthe improvements of this invention.

Figure 2 is an end elevationof the machine shown in Figure 1, as seenfrom the right hand end thereof, certain parts being removed.

Figure 3 is a transverse sectional view as seen from line 3-3 on Figure1.

Figure 4 is a vertical sectional view on line e-fi of Figure 1.

Figure 5 is a longitudinal sectional view as seen from line 5-5 onFigure 3.

Figure c is a fragmentary elevational view ci the parte ci the machineshown in e l and illustrating a modication.

Figure 7 is a transverse sectional view taken on line 3 7 of Figure d.

Figure e is a sectional view taken on line 8 8 of Figure 8.

Figure 9 is a sectional view taken on line 9 6 ol Figure t.

Figure 10 is e. sectional view taken on line lll-10 of Figure 9.

'Figure il is an enlarged sectie view leisen on line :il- All of Figurei?.

Throughout the several views oi7 the draw ings similar referencecharacters are employed to denote the same or similar parts.

This invention, as noted above, pertains particularly to a machine iorexpeditiously pro- 1933, z No. @51,3%

(0L Kif-105i ducing an exterior ground surface ,or revolution on hollowor cylindrical work pieces which are relatively dimcult to supportduring the grinding operation, or which require an unusual amount'oitime to properly mount on a mandrel, arbor or the like. In general themachine comprises a work receiving member, such as a spindle nose orworh arbor on which the work is held by suitable holding means andsubsequently presented to the grinding wheel. 'lhe work holding means istied in with the feeding or presentation means so that a sequence ofoperation is had for ilrstwproperly centering, securing and rotating thework prior to the presentationthereoi to thegrinding wheel andsubsequently retracting the same from the work. and nnally releasing,stopping the rotation. and electing the work from the machine.

Specifically, the grinding machine comprises a bed from the uppersurface oi which rises a pedestal bearing supporting a spindle 18 to 4which is secured the grinding wheel 17. The spindle 16 and wheel 17 areadapted to be rotated at a relatively high grinding rate of speed andthe grinding wheel ispartially enclosed a5 within a hood or guard 18usual with machines o! this character for confining the coolant employedtherewith. 'Ihe guard 18 has projecting therefrom a ledge or shelf 19supporting a slide 20 carrying the truing mechanism 21 adapted to truethe operative face of the' grinding wheel 17.

The bed 15 is further provided on its uppersurface with a dove-tailedguide 22 received in a correspondingly shaped guldeway 23 formed on theunder side of the work supporting slide 24. In order to shift thehousing or slide 24 there is provided, see Figures 1 and 5, an adjustingscrew 25 having its threaded end received in a nut 26 rotatablyjournaled in a bearing provided by the housing 2li. The outer end oi thescrew 25 extends through and beyond a bearing bracket 2'! and to theprojecting end oi which is secured a hand or pilot wheel 23 whereby thesaid screw is rotated for enacting maior adjustments of the housing orslide 2e. Keyed or otherwise secured to the nut 26 is a barrel cam 29having formed therein a cam track receiving the head of a guide pin 30carried by cup. member 3l screwed or otherwise secured to the housing24. Further secured to the nut 25 is a manually operable inieed lever 32which eects the cycle oi the machine when same is to he manuallyoperated.

.es seen in Fi 3, the housing or slide 24 has formed integral therewitha pair oi bea :is and 24 in which is secured the usual tapered spindlebearing bushings 35 and 3e for the work supporting and rotating spindle37. The spindle 37 between the bearing bushings 35 and 36 is providedwith a sprocket 38 about which is trained a sprocket chain 39, seeFigure 2, in turn extending about the sprocket 40 secured to a shaft 41projecting from the rear side of the bed near the lower edge thereof.The shaft 41, interiorly of vthe bed, is geared or otherwise coupled tosuitable sliding gears within the variable speed box 42 secured to theright hand end of the bed 15. Suitable shift levers 43 being providedfor actuating the sliding gears and effecting and controlling the rateof rotation of the shaft 41 and consequently the spindle 37.

The outer end of the spindle 37, see Figure 3,

has secured to it in any desirable manner a chuck or sleeve 44terminating in a stub arbor 45 received in a finished bore in the workpiece 48. The work piece 46 is held on the chuck 44 by a holding orclamping head 47 in which is disposed the anti-friction bearings 48 forthe end plate 49, which actually contacts with the free end of the work.In other words, the work is held or secured to the chuck for rotationtherewith by clamping same between the plate 49 and a shoulder 50 formedon the chuck head 44.

The clamp head 47 is integral with a lever 5i loosely journaled on ashaft 52 rotatably mounted in bearings 53 provided by the housing orslide 24. Secured in any desirable manner to one end of the shaft 52,adjacent the arm 51, is a pressure finger 54 having mounted in its freeend a spring pressed plunger 55 that engages with a shoulder 56 on thelever 5l for yieldably actuating the same in a clockwise direction intoengagement with the work 46. The shaft 52 has secured to its other end atrigger 57 that lies against the fiat surface 58 of the axiallyshiftable rack bar 59. The bar 59 has formed therein at the end of theilat 58 a notch 60 to provide a shoulder 61 that engages with thetrigger 57 for rotating or oscillating same together with the shaft 52in a counterclockwise direction. 'I'he oscillation of these parts insaid counterclockwise direction raises the pressure finger 54 andthrough the pin and slot connection 62 effects the elevation of the arm51 and thereby freeing the work so that it may be subsequently ejectedfrom the chuck 44.

The rack bar' 59 is axially'shiftable through bearings 63 provided bythe housing or slide 24, interiorly thereof, and has'formed near itslower end rack teeth 64 intermeshed with the teeth on pinion 65. Thepinion 65 is keyed or otherwise secured to the inner end of the nut 26and rotates with said nut during the rotation thereof by means of themanual infeed lever 32 above referred to. From the foregoing it will benoted that rotation or oscillation of the nut 26 in a direction toretract the Workfrom the grinding wheel also elevates the arm 51 andconsequently the clamp head 48 while a rotation or oscillation of saidnut in the opposite direction lowers the pressure head into position forholding the work on the chuck.

Mounted on the housing or slide 24 near its right hand end is a bracket66 forming a bearing for the work ejector actuating member 67 which hasformed in its one end a slot 68 in which is disposed a pin 69 projectingoutwardly from the surface of the infeed lever 32. The other end of themember 67 is provided with a trigger 70 adapted to engage with a tooth71 formed on cam member 72 keyed or otherwise secured to the end oflongitudinal shaft 73. The shaft 73 at its inner end has keyed orotherwise secured to it an arm` 74 to which is pivoted, as at 75, one'end of a link 76. The other end of this link 76 is pivoted as at 77intermediate the ends of. an arm 78 in turn pivoted at 79 to anextending lug 80 'of the housing or slide 24. The free end of the arm 78is provided with a bumper 81 engaging a pusher 82 on the end of ejectorrod 83 which passes through the hollow interior of the spindle 37. Theinnerend of the rod 83 has secured theretoor formed integral therewith ahead 84 from which project ejector pins 85 which pass through the chuck44 and stop short or the inner face of the work 46.

The operation of the mechanism described thus far is as follows: Thelever 32, when the work piece is being changed on the chuck, is in avertical position or considerably to the left of the position shown inFigure 3, with the head or slide retracted or remote from the grindingwheel and with the arm 5l elevated free of the work. A work piece isthen mounted on the chuck 44 with the inner end thereof engaging theshoulder 50 whereupon the lever 32 is initially oscillated to theposition shown in the drawings, particularly as shown in Figure 3. Thiseffects a rotation of the nut 25 and through the rotation of the pinion65 secured thereto raises or axially elevates the rack bar 59 to theposition shown in Figure 4 which through the flat 58 thereon oscillatesthe finger 57 and shaft 52 thereby lowering the pressure linger 54 andpressure arm 51 to cause engagement of the pressure plate with the freeend of the work. Simultaneously with the centering and clamping of thework the slide or housing 24 is rapidly advanced to the position shownin Figure 5 through the co-operation of the barrel cam 29 and follower30. From this it will be understood that the cam groove in the barrelcam 29 is provided with a rapid lead for rapidly shifting the worktoward the grinding wheel and it should further be noted that the camgroove then has a substantial straight or no lead portion so that afterthe work and wheel are operatively associated no further movement of theslide is had from the barrel cam 29. After the work and grinding wheelare in engagement the lever 32 is further actuated to complete an arc ofsubstantially ninety degrees from its initial or vertical position to ahorizontal position or with the lever contacting the upper edge of thebed 15. 'Ihis continued movement of the lever 32 is at a slow rate androtates the nut 26 for slowly shifting the nut along the screw andthereby slowly feeds the work into the grinding wheel.

The lever 32 is then allowed to remain in its lowered position to permita sparking out between the work and wheel whereupon the lever isreversed which first retracts the slide 24 to the position shown inFigures 1 and 5 and returns the rack bar 59 to the position shown inFigure 4. Continued return movement of the lever 32 further lowers therack bar 59 which through the shoulder 61 thereon reversely oscillatesthe shaft 52 and raises the pressure arm 51 from the work.Simultaneously with this movement the pin 69 on the lever 32 picks upthe member 67 and through the trigger 70 and cam 72 oscillates the shaft73 for shifting the link 76 and ejector arm 78. The movement of the arm78 is clockwise, as seen in Figure 3, which axially shifts the ejectorrod 83 and pins 35 for pushing the work from the anni chuck flfhe workis received in a suitable receptacle placed to receive same at the endof the work spindle. f

The modification shown-in Figures o to 11, inclusive, illustrates asemi-automatically operated machine having a modified work supportingchuck mechanism together with means for stoleping the rotation of thespindle during the replacement of the work thereon.. As shown in Figure7, the sprocket 38a is mounted on antifriction bearings 96 so as tonormally freely rotate relative to the spindle. The r end of thesprocket`38a ieprovided with clutch teeth 87 adapted to intermesh withcorresponding clutch teeth formed on the adjacent face of shiftableclutch member 88 splined to the spindle 37. As shown in Figure 7, theclutch teeth are in engagement and the clutch member 88 is provided onthe end opposite to the teeth with a brake face adapted to engage withcorresponding brake face 90 formed on brake member 91 secured in anydesirable manner to the housing or to the spindle bearing bushing 92. inorder to axially shift the clutch 88 it is provided with acircumferential groove 93 receiving thereina shipper finger 94 carriedby the chuck actuator bar 95. The bar 95 is adapted to be axiallyshifted through a suitable way provided in the slide or housing 24 andhas formed on its' one end a notch 96 receiving the ball end of apivoted lever 97 adapted to engage at its other end with a pusher rod 98for releasing the cat head clamp 99.

` The clamp 99 has projecting from it a rod 100 terminating inengagement with the end of the pusher rod 98. Extending about the clamprod 100 is a spring 101 engaging on one end with the chuck body 102 andonthe other end with an adjustable abutment 103. The chuck body 102 issecured in any desirable manner to the end of the spindle 37 and istherefore immovable and causes the spring 101 to tend to shift theabutment 103 and consequently the clamp rod 100 to the left, as seen inFigure 7. This movement of the head 99 causes the arms 104 and 105thereof to engage with the tapered or caml nose 106 of the chuck 102 andto open up and engage with the work collet 107 carried by the chuck 102.Movement of the pusher rod 98 to the right through the shifting of therelease rod 95 to the left shifts the cat head clamp to the right out ofcontact with the cam face or nose 106 thereby permitting the spring 108to oscillate the jaws 104 and 105 toward one another and free the collet107 whereupon it, together with the work carried thereby, may be removedfrom the machine so that additional unfinished work pieces may bemounted on the chuck. It will be noted that the clamp was released byshifting the bar 95 to the left which simultaneously disengages theclutch 88 and eilfects a contact between the braking faces 89 and 90foi` stopping the rotation of the spindle during the replacement of thework.

In order to operate the rod 95 it has pivoted to itsf4 inner end as at109 one end of a link 110 the other end of which is pivoted at 111 to alever 112 carried by a longitudinal rod 113 which is similar in allrespects to the rod 73 above described. The rod 113 is operatedautomatically and terminates in an automatically actuated mechanismenclosed Within the housing 114, see Figure 6.

The housing 114 encloses the necessary mechanism for automaticallyedecting the oscillation of the shaft 119 and alsa edects the automaticadvancement and retraction of the housing or slide 24 and consequentlythe work piece carried thereby as respects the grinding wheel. Thismechanism comprises a bearing 115 integral with the housing 114 in whichis iournaled for sliding movement .a block 118 in which is mounted forrotative movement a reduced por-V justment of the screw 25 comprises apair of pitmen 118 having their -opposite ends respecthe housing oravery couples. er pivoted to the block 11o and i bell crank 119. Thebell crank 119 in turn'is pivoted at the juncture of its arms to thehousing and carries at the end of one of its arms a cam follower 120received in cam 'groove 121 which is so designed as to effectfflrst arapid advance of the slide or housing 24 funtil the work engages thegrinding wheel whereupon a slow infeed is effected between the work andwheel, followed by a dwell in the movement of these parts and then arapid falling away to retract the work from the grinding wheel. The cam122 is keyed or otherwise secured to a shaft 123 rotatably journaled ina bearing provided by the housing 114 to which is further secured a wormwheel 124 meshing with a worm 125 belted or otherwise connected with aprime mover 126 secured to the housing 114 exteriorly thereof.

From the foregoing it will be noted that the movement of the work isautomatic when once mounted on the machine. In order to oscillate theshaft 113 in timed relation with the movement of the carriage 124 theshaft has secured .to it interiorly of the housing 114 a. single toothratchet wheel 127, the tooth 128 of which engages a lug 129 of anaxially shiftable rod 130. The rod 130 has a pin and slot connection asat 13.1 with a lever 132 pivoted at 133 to a lug 134 projectinginteriorly of the housing 114. The lever 132 has projecting from it acam follower 135 adapted to engage with the face cam 136 formed on therear face of the cam 122 so as to oscillate the lever 132 in timedrelation with the rotation of the cam 122.

In order to automatically eject the work and collet 107 from the chuck102, the said chuck has loosely mounted therein for axial movementrelative thereto a plurality of ejector pins 137. The ejector pins 137each have formed on its inner end a head 138 adapted to be engaged bythe flange 139 of spring cup 140. 'Ihe spring cup 140 forms part of thespring abutment 103 and therefore moves with the clamp head rod 100 whenthe said rod is moved to release the work. As will be seen from thedrawings, lost motion is provided between the heads 138 of the pins 137and the flange 139 so that the clamp head 99 is free of the work beforethe ejector pins engage same and eject it from the chuck.

In View of the foregoing description of the operation of the manuallyoperated machine, it is believed that the operation of thesemi-automatic modification thereof will be evident without a furtherdescription thereof. It should, however, be noted that after a workpiece is mounted on the chuck it is first automatically centered andthen clamped in position whereupon the work is automatically advanced tothe grinding wheel, fed relative thereto, retracted therefrom, and thenreleased to permit a replacement of the work, whereupon the cycle isrepeated.

What is claimed is:

1. In a grinding machine of the class described the combination of abed, a grinding wheel rotatably mounted thereon, a work rotating spinglerotatably mounted on the bed for movement toward and from the grindingwheel, a support for the work rotating spindle, a chuck on said workrotating spindle for receiving a work piece, means on the support forengaging the work to hold same on the chuck during the grindingoperation, means for actuating the support relative to the bed to effecta feed between the work and grinding wheel, and means co-ordinating themovement of the work holding means and work feeding means whereby theyare operated in sequential order.

2. In a grinding machine of the class described the combination with abed, of a grinding wheel rotatably mounted thereon, a work supportingand feeding unit comprising a support mounted on the bed for movementrelative thereto toward and from the grinding wheel, a chuck on thesupport for receiving thereon the work to be operated upon,- anoscillatable arm adapted to engage the free end of the work to hold thesame on the chuck, means for oscillating the arm toward and from thework, and means operable to eject the work-"1mm the chuck when the armis raised out of contact with the work.

3. In a grinding machine of the class described the combination with abed, of a grinding wheel rotatably mounted thereon, a work supportingand feeding unit comprising a support mounted on the bed for movementrelative thereto toward and from the grinding wheel, a chuck on thesupport for receiving thereon the work to be operated upon, anoscillatable arm adapted to engage the free end of the work to hold sameon the chuck, means for oscillating the arm toward and from the work,means operable to eject the Work from the chuck when the arm is raisedout of contact with the work, and means synchronizing the movement ofthe ejector and arm whereby the ejector is not operated until the arm isfree of the work.

4. In a grinding machine of the class described the combination with abed, of a grinding wheel rotatably mounted thereon, a work supportingand feeding unit comprising a support mounted on the bed for movementrelative thereto toward and from the grinding wheel, a chuck on thesupport for receiving thereon the work to be operated upon, ancscillatable arm adapted to engage the free end of the work to hold sameon the chuck, means for osciiiating the arm toward and from the work,means operable to eject the work from the chuck whe the arm is raisedout oi contact 'with the means synchronnring the movement ci" theegectcr and arm whereby the ejector is not operated until the arm isfree of the work, means for effecting the movement ci the work supporttoward and from the grinding wheel, and means synchronizing the movementof the work support with the movement of the work holding arm andejecting means.

5. In a grinding machine of the class described for producing exteriorsurfaces of revolution on hollow work pieces the combination with a bed,and a grinding wheel rotatably mounted on said bed, of a work supportingand feeding unit comprising a support on the bed. a work rotationspindle rotatably journaled in the support, a chuck associated with thespindle and received in the bore of the work, clamping means engagingthe outer end of the work to hold same on the chuck, means for feedingthe work support toward the grinding wheel while the work is clamped onthe chuck, and means for ejecting the work from the chuck.

6. In a grinding machine.of the class described for producing exteriorsurfaces of revolution on hollow work pieces the combination with a bed,and a grinding wheel rotatably mounted on said bed, of a work supportingand feeding unit comprising a support on the bed, a work rotationspindle rotatably journaled in the support, a chuck associated with thespindle and received in the bore of the work, clamping means engagingthe outer end of the work to hold the same on the chuck, means forfeeding the work support toward the grinding wheel while the work isclamped' on the chuck, means for ejecting the work from the chuck, andmeans synchronizing the movement of the support with the clamping andunclamping of the work as well as with the actuation of the ejector.

7. In a grinding machine of the class described for producing exteriorsurface of revolution on hollow work pieces the combination with a bed,and a grinding wheel rotatably mounted on said bed, of a work supportingand feeding unit comprising a support on the bed, a work rotationspindle rotatably journaled in the support, a chuck associated with thespindle and received in the bore of the work, clamping means engagingthe outer end of the work to hold same on the chuck, means for feedingthe work support toward the grinding wheel while the work is clamped onthe chuck, means for electing the work from the chuck, meanssynchronizing the movement of the support with the clamping andunclamping of the work as well as with the actuation of the ejector, andmeans for stopping the rotation of the chuck prior to the ejection ofthe work therefrom.

8. In a grinding machine of the class described for producing exteriorsurface of revolution on hollow work pieces the combination with a bed,and a grinding wheel rotatably mounted on said bed, of a work supportingand feeding unit comprising a support on the bed, a work rotationspindle rotatably `iournaled in the support, a chuck associated with thespindle and received in the bore of the work, clamping means engagingthe outer end of the work to hold same on the chuck, means for feedingthe work support toward the grinding wheel while the work is clamped onthe chuck, means for ejecting the work from the chuck, said clampingmeans comprising a member adapted to engage the free end of the work,yielding means for holding said clamping member in engagement with thework, and positively actuated means for rendering said yielding meansinoperative and reieasing the Work.

9. In a mechanism for supporting and rotating hollow work pieces forpresentation to a grinding wheel the combination of a bed, a

